The TYN20-800T from WeEN Semiconductors is a Silicon Controlled Rectifier with Breakover Voltage 800 V, Breakover Current 210 A, Gate Trigger Voltage 0.2 to 1.3 V, Gate Trigger Current 0.032 A, Temperature Operating Range -40 to 150 Degree C. Tags: Through Hole. More details for TYN20-800T can be seen below.